Grinding machine



A. E. JACOBSON Feb. 9 ,1925, 1,572,722

GRINDING MACHINE Filed Sept. 10, 1924 2 Sheets-Sheet 1 zfl H. 5. JHIIOBSOAL I B) #15 0mm INVEIY T017.

Feb. 9 ,1926. 1,572,722

. A. E. JACOBSON GRINDING MACHINE Filed Sept. 10,. 1924 2 Sheets-Sheet 2 Patents Feb. 9,1926

AXEL E. JACOBSON', OF MI INNEAJPOLIS, MINNESOTA.

GRINDING- MACHINE.

Application filed September 10, 1924. Serial No. 736,908.

tains to make and nse thesame.

This invention relates to a grinding inachine and particularly to such a machine adapted to grind grain feed, and the like. It is an object of the present invention to provide a grinding machine having, novel and efiicientgrinding devices and improved means for feeding the material thereto. It is also an object of the invention to provide a grinding machine comprising amasing and a grinding inemben therein including spaced disks having openings therethrough alined with an opening in one side of the casing, said grinding member acting as a fan to draw the material to be ground through said opening in the'casing and through the apertures in said disks.

It is also an object of the invention to provide a grinding machine comprising a casing having a shaft extending through one side thereof and terminating adjacent the opposite side, said latter side having an opening through which mater al is drawn by the fan action of the grinding head.

It is more specifically an ob ect of the 1nventioii to provide a grinding machine, as set forth in the preceding paragraph having a grinding head, including spaced disks. certain of which have central" apertures therethrough for the passage of the mate- .rial, said disks'being secured to an openwork or spider member carried by said shaft.

These and other objects and advantages of theinvention will be fully set forth in the following description made in connec tion with the, accompanyingdrawings in which like reference characters refer to the sameparts throughout the different views, and in Whicln T Fig. 1 is a view in side elevat on of a portion of the device, certain parts being bro ken away, and others shown'invertical section y 2 is a vertical section taken on the line 2-2 of Fig. 1-, asindicated by the arrows; i

Fig. 3 is a vertical section taken on the hne 33 of Fig. 2, as indicated by the arrows;

Fig. 4: is a view .in side elevation of a spider member used; K

Fig. 5 is aview in'end elevation, as seen from the right of Fig. 4;

Fig; 64's a view in vertical sect-ion of a' portion of the beater assembly;

Fig. 7 is a view in end elevation showing the means for holding the beater shaft in place; and- I Fig. 8 is a view in side elevation of av stud used in said mechanism, Figs. 3 to 8 being shown on an enlarged scale.

The present invention is ani-mprovement upon the-machine disclosed in applicants prior Patent 1,374,207, granted April 12, 1921 and discloses more fully parts of the machine disclosed in applicants co-pending application, S. N. 633,732 filed April 21,

1923-, to which latter application reference may be had for parts not shown in'the present application.

Referring to the drawings, a grinding I machine isshown whichis of the type shown 'in the co-pending application referred to.

In the present case it will only be necessary to consider certain parts of the machine as shown in saidco-pcnding application. The machine comprises a casing 10 of generally cylindrical form having sub,- stantially vertical sidewalls. The lower portion of the casing is formed by the end 11. of the main'base of the machine, which portion 11 hascurved end walls and an open ottom. Flanges 12 project inwardly at the I uppereportions of member 11 and are apertured to receive a pair of spaced curved rods 13 threaded at their ends to receive nuts bearing on top of the flanges 12. The

rods 13 support a screenlt, the endsof which project upwardly at the outside of the lower portion of the top of casing 10. Said lower portion is formed with downwardly inwardly beveled surfaces against. which the ends of screen 14 are "clamped bysliding plates 15 having downwardly extending flanges" and resting uponthe top of the member 11. The members 15 are pushed inwardly against the screen by headed screws 16 threaded in the'member 11. The base member 11 supports and has secured thereto front and rear rings 17 and 18,,respectively. These rings 110 are of channel shape in cross section, as

clearly shown in Fig. 3 and the front ring 40 their heads countersunk in said diskh.

- through The top portion of casing is 5 formed by a plurality of grinding plates 21 and 22. Said plates rest upon the rings 17 and 18 and are bolted thereto by bolts extending through the outer flanges of said rings. -The plates 21 have roughened pr 1 corrugated 'grinding surfaces thereon while plate 22 carries a plurality of transversely extending grinding bars 23 held in place by th .screws24. The rear ring 18 is provided with an inte ral central plate forming the rear wall of-t e casing and a shaft 25 extends. through this rear wall passing through an ape'rture' therein, in which it snugly fits, said shaft being supported in bearings 28 in the base of the machine, the main portion of-Which isnot shown. The shaft is adapted to be driven by abelt or motor from the customary belt pulley, as shown in applicants co-pending application. The shaft 25.has keyed thereto an 25 openwork or spider member 26. This member (see Figs. 2 to 5) comprises a central hub 26 and radially extending arms 26*.

At one end the member 26 has a projecting ringor flange forming a shoulder 26- and 3 the arms 26 are stepped, respectively, to form shoulders 26 and 26. The member 25 has securred thereto a plurality of disks 27, p

said disks having central or axial apertures or holes of the'same diameter as the diameter of the surfaces of the shoulders-26, 26 .26,

and said disks are secured, respectively, to' said shoulders, as clearly shown in Fig. 3, said disks being secured to the arms 26 by rivets passing through said arms and having With this structure it will be seen that the com bined structure of the shaft 25, spider 26 and disks-27 is closed at the rear by the rear disk 27 and the spider, but that there are 5 openings between the arms 26 and through the-apertures in the-front disks 27. The

apertures-in the front disks 27 are alined with the opening 20 in. the front wall-'19 there being an unobstructed circular open 50 'ing through front disk 27 and an unobstructed annular opening. through the intermediate .disk 27. p

Outward of the openings in the disks the same are bored to receive shafts 29 extending therethrough and extending somewhat beyond the outer surface of the outer disks; LSaid shafts'carry between said-disks headed bushings 30-on which are pivotal'ly mounted a series of spaced beater blades 31 having spacing washers 32 therebetween. The outer sides'of the outer disk'sf27 have. swinging plates 33 bolted .thereto having a hook slot at one end adapted to embrace ashoulder portion 34 of headed studs 35 secured in I said disks. The hook plates'33 are disposed .this time the'top plate 42 to pass partially across the apertures in the disks 27 and enter slots in the shafts 29. and thus hold the shafts in place. The studs 35 are tightened to hold plates 33 in position and centrifugal force also tends to hold said plates in place should studs 35 become loose. K a 1 Secured to the front of the casin 10 is a vertical chute 36 having an open side communicating with the o ening 20 in the front wall of'the casing- 'I he lower part of the chute is formed "as a swinging door 37 and said chute also has pivoted to one side thereof and extending thereacross an adjustable air baflie 38. The material is fed to the machine through a trough 39 having therein a screw conveyor 40. The conveyor 40 delivers the material from the troughinto a casing 41 disposed directly above the chute 36, which casing hasa swinging top section 42 carrying therebeneath a chute or spout .3. The upper end of spout 43 normally is disposed beneath the discharge over and above an inwardly. and upwardly extending bottom plate 44 of the casing '41. The lower front wall of casing 41 carries an adjustable angle plate 45 movable toward and from the bottom plate 44. Thetop plate 42 is adapted to be swung upwardly, as indicated in dotted lines in Fig. 1 and is frictionally mounted so that itwill osition. In operation, the material to be ground, such as grain of various kinds, will be fed 'throughthetrough 39 by the conveyor 40 and will drop into the spout 43. Power be\ tayin any adjusted ing' applied to the machine the'shaft 25 and the grinding head comprisin member 26, disks 27 and the beaters carri thereby, will be rapidly rotated. This grinding head,

owing to its construction, acts as a fan and creates a strong draft through the opening 20' in the side Wall of the casing and hence through the chute 36. The material dischargedat the lower end of spout 43 tends to drop down on the bottom plate 44 but is carried by 'the'air current up over the top edge of the plate 44 and down into the chute 36, from which'it is-drawn into-.the' casing 10 through the opening 20. Any heavy for eign material, such as stones or nails will drop onto the plate 44 ahdbe discharged from the machine. [Hea articles may alsoco'llect in thebottom of c ute 36 and on the door 37. Theam'ount of air entering the chute through the-casing 41 may be regulated by adjustmentof the plate 45. When certain materials; are being ground the use of v the separatingcasingi41 isundesirable and at is swung upwardly,

as shown in .do'tted lines in Fig. 1' and the material is discharged directly from trough "39 .into chute 36;

The material entering the casing lt) passes through the opening. in the front disk 27 and part of this passes between this disk and the next disk. Part of "the material is also .drawn through the intermediate disk or disks so that the material is nicely 'distrib charged through the screen 14, the exit'of. the material being assisted by the draft of air forced through said screen by the fan action of the grinding head. The air baffle 38 can, of course, be adjusted to give the desired,action on the material in the chute 36. It will also be noted that the beater units on the bushings 30 between each pair of disks can be released by swinging the hook plates 33 out of the slots in the ends of shafts applicant has provided a simple, efficient and rugged grinding mill, the parts of the mill are comparatively few and simple and there are few adjustments to be made and little. attention is necessary for maintenance. The-device has been amply .demonstrated in actual practice and is being commercially made and sold.

It will, of course, be understood, that various changes may be made in the form, details, arrangement and proportions of the parts Without departing from the scope of applicants invention, which, generally stated, consists in a device capable of carrying out the objects above set forth, such as shown and described and defined in the appended claims. v I

What is claimed is:

1. A grinding niachinehaving in combination, a substantially cylindrical casing having one closed side and an axial opening in its other side, a shaft extending axially of said casing through said closed side, a rotary grinding head in said casing comprising a plurality of spaced'disks disposed at right angles to said shaft, said disks except the one adjacent the closed side of the casing having central openings therethrough, and means secured to said shaft having spaced arms disposed between and secured to said disks and affording openings through said latter disks for material entering said axial opening topasstherethrough, said means and the disk adjacent the closed side of said casing forming an imperforate side of said .grindin g head. i

2. A grinding machine having in combination, a substantially" cylindrical casing having-one closed side and an axial opening initsother side. a shaft extending axially of said casing through said closed side a rotary grinding element in said casing comprising a plurality of spaced disks'disposed at right angles to said shaft', the'bne of said disks adjacent said opening in said casing having a central opening therethrough forming ,an unobstructed passage adjacent the center thereof andradjacent said axial opening in theicasing;

3. A grinding machine having in combination, a cylindrical casing having substantially vertical side walls, one of which has an axial opening therein, a shaft extending throughthe other side of said casing, a

grinding member in said casing comprising spaced disks carrying heaters therebetween, the disk remote from said side opening being imperforate, the other disks having central apertures therethrough alined with said axial opening in said side wall, said grinding head comprising a spider secured to said shaft having arms projecting toward said axial opening where y an unobstructed annular opening is provided through said other disks acting as a fan to draw material'to be ground into said opening and through said apertures.

4..A grinding machine having in combination, a cylindrical casing with substantially vertical side walls, one of which has an axial opening therein, said casingliaving an imperforate grinding surface in its upper portion and a screen 'in its lower portion, a rotary grinding member in said casing comprising spaced disks carrying swing ing-beaters therebetween, a shaft projecting into said casing, and an openwork member secured, to said shaft to Whl('l1 said disks are secured having a hub disposed some distance.

from said axial opening and arms projecting radially from said hub and toward said axial opening and secured to the one of said disks adjacent said axial opening, the disks adjacent said side wall ha'ving central apertures thcrethrough whereby openings are formed through the disks and said openwork member, said grinding head acting as a fan to draw air and material through said opening in the side wall and through said disks and openwork member.

ing having a centralaperture therethrough alined with the said opening in said casing wall, and means carried by said shaft and extending inwardly from said disk for suportin the same and leavin its central 1 D 15 opening unobstructed, and grinding memher constituting a fan for drawing material through said opening'and apertures. fl

6. A grinding machine having in combi nation, a substantially cylindrical casing 8 having one closed side and an axial open-' ing'in its other side, a shaft extending axially of said casing through said closed side, a rotary grinding element in said casing comprising a plurality of spaced disks dis- 10 posed at right angles to said shaft, the one of said disks/adjacent the closed side of the easing being impertorate and the other disks having central openings therethrough alined with the axial opening in the side of said' casing, and means securedto said shaft and supporting said disks and forming an unobstructed circular passage through the disk adjacent said axial opening, and an unobstructed annular passage through the disk adjacent. said disk.

7. A grinding mill having in combination, a casing having a feed opening 'thereinto, an upwardly extending, chute leading to said opening and means above said chute comprising 'vertieally spaced downwardly inclined members, the lower end of said upper member extending an appreciable distance ovdr the upper end of said lower member, whereby the perpendicular from 3 the lower; edge of said upper member intersects the lower member an appreciable dis-' r tance from its upper end, means for feeding the material to be ground onto said upper member, at grindingniember in said casing comprising boaters constituting a fan to draw air through said opening whereby the .material to be ground passing off said upper member will be lifte'd upward over the upper edge of said lower member and be drawn 4 through saidtopening into said casing and heavy foreign 'material will onto said lower member.

8. The structure set forth in claim 7 said second mentioned casing having -a hinged top plate carr'yingsaid spout adapted to be swimgnpwardlfii whereby materialwill be received directly into said chu e.

9.1K grinding mill having-in combinatio'n,,a grinding easing having a feed open? .9 ingthereinto, a chute leading td saidopenf. ing, a'member above said chute 'adap tedto ,receiye the material having an inclined bottom terminating at itsupper. end adjacent.

said chute anda discharge opening at the pass downward lower end thereof, an inclined swingablefis spout in said member on which the material is charged having an end portion overlapping and vertically spaced from said' inclined bottom, a grinding member in said first mentioned casing constituting a fan adapted to draw air through said first mentioned chute and said discharge 0 ening and through the material dischargec 'from said last mentioned chute whereby said material is drawn into said first'mentioned casing and chute and heavy foreign articles ,pass out of said member on said inclinetl bottom.

10. The structure set forth in'elaim 9, and

an adjustable means for varying thesiz'e of 79 c saiddiscl-iarge opening in said member whereby the. material drawn into said'casmg may be varied. i

11. A grinding mill having. in combination, a casing having a feed opening there 7 into, a chute leading to said opening, a mem bcr above said chute having vertically spaced overlapping inclined members, the upper one of which receives the material, a grinding member in said first mentioned casing constituting a fan adaptedto draw air between said inclined members and carry the material to be ground into said first mentioned chute, any heavy foreign-articles being discharged from the, lower inclined member said upper inclined member being swiugable out of alinement with said chute.

12. The" structure set forth in ,claim 1, said central openings in said. other disks be' ing of different sizes according to the loca tion of said disks relative to; said axial opening, the disks most remote from said-=- ing having the largest openings axial open therethrough, v Y v 13. A grinding machine having] in com 'i nation, a substantially cylindrical casing, a shaft extending axially of said casing, a. grinding head carried by said shaft and compris ng a plurality of spaced disks having openings thereth-rough.at their central portions, a; head secured to said shaft hav'-- ing spaced means. extending to and secured tosaid 'disks sothat unobstructed opening s through said disks are formed a djacent the Centers thereof; 1 v 105 T In testimony whereof I aflix my signatureJ-f Y 1 AX EL JAOOBSON. 

